FYI I boil all my molds in soapy boiling water to remove the oil. The low temps of boiling water will not hurt the molds. Dry and start casting to perfent rust forming.
Or use a healthy washing with a good break cleaner spray to degrease.
Casting those little 40gr pills is tough, it's very difficult to keep the mold up to temp, that's my guess as to where the wrinkles are coming from. Of course, they're just plinkers, and the bases are filled out, so I figure they'll fly 25 feet pretty well, only one way to find out I suppose. Not really looking forward to a marathon casting session though, got 500 brass laying around ready to load.